Convert PNG to Base64
Drop a PNG image to get validated Base64, a Data URI, and ready-made HTML and CSS snippets — encoded in your browser, never uploaded.
Input — PNG file○ Waiting for input
Drag & drop a PNG here
or
Inspection Report
File metadata
- Detected Type
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- MIME Type
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- Encoding
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- Input Length
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- Decoded Size
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- Padding Status
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- Data URI
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- File Signature
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- Preview Availability
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How to convert PNG to Base64
To convert a PNG to Base64, drag the image onto the tool above or choose it from your device. The tool verifies the PNG file signature, previews the image with its dimensions, and produces the Base64 string, a data:image/png;base64,... Data URI, and copy-ready HTML and CSS snippets. All processing is local to your browser.
How to Use
- Drag a .png file onto the drop zone, or click Choose File.
- The tool checks the PNG signature and shows a preview with dimensions and file size.
- Copy the plain Base64 or the Data URI output.
- Use the HTML <img> snippet or the CSS background-image snippet to embed the image directly.
- Working with several formats? The Image to Base64 tool handles PNG, JPG, WebP, GIF and SVG in one place.
Real Example
A 24 KB icon of 512 × 512 pixels encodes to roughly 32,000 Base64 characters beginning with iVBORw0KGgo — the unmistakable start of a Base64 PNG, produced by the eight-byte PNG signature 89 50 4E 47 0D 0A 1A 0A. The CSS tab gives you background-image: url("data:image/png;base64,iVBORw0KGgo...") ready to paste into a stylesheet, transparency fully preserved.
Code Snippets
// Encode a PNG as a Data URI (browser)
const dataUri = await new Promise(resolve => {
const reader = new FileReader();
reader.onload = () => resolve(reader.result);
reader.readAsDataURL(file); // "data:image/png;base64,iVBORw0KGgo..."
});How PNG to Base64 Works
Every PNG file starts with the same eight bytes — 89 50 4E 47 0D 0A 1A 0A — which is why Base64 PNGs always begin with iVBORw0KGgo. This tool verifies that signature before encoding, so a mislabeled file is caught immediately. Because Base64 is a byte-exact encoding, PNG features like alpha transparency and lossless compression survive the round trip untouched. For very small images such as icons, a Data URI can even save an HTTP request; for larger images, a normal file usually remains the better choice.
Common Use Cases
- Inlining icons and UI graphics into CSS without extra HTTP requests.
- Embedding a transparent logo in an HTML email template.
- Shipping a single-file HTML demo with all images inside it.
- Passing an image through a JSON API as a text field.
FAQ
Does this tool only accept PNG files?
Yes. It verifies the eight-byte PNG signature and rejects other formats with a clear message, so a mislabeled file never produces misleading output. For mixed formats, use the Image to Base64 tool.
How do I use the output as a CSS background image?
Copy the CSS snippet tab: it produces background-image: url("data:image/png;base64,...") with your data inside, ready to paste into any stylesheet.
Does PNG transparency survive Base64 encoding?
Yes. Base64 encodes the file byte-for-byte, so the alpha channel and everything else in the PNG is preserved exactly.
Why is my PNG file rejected?
The file bytes did not match the PNG signature — it is probably a different format with a .png name. Try the tool for its real format, for example JPG to Base64, or the multi-format Image to Base64 tool.